ts, find a 90% confidence interval for the population standard

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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i have the answer, can somebody please explain how she got 17.708 for X2L?? my chi. table does not show this number and when i subtract 1-42.557 i get a negative number. 

i also do no use excel. please explain. 

thanks. 

2. Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard
deviation of 12.23 points, find a 90% confidence interval for the population standard
deviation.
ト=30 S=12.23
0.95
0.05
aos
22=17.708
xR=42.557
(w-1) (R.2) col
42.557
(30-1)02.2372
17.708
10.10C oe 15.65
we
goy. confident That Me populution Shandarld
devistion E(l Stadent IQ Scor es is betwoln
are
Transcribed Image Text:2. Suppose a sample of 30 ECC students are given an IQ test. If the sample has a standard deviation of 12.23 points, find a 90% confidence interval for the population standard deviation. ト=30 S=12.23 0.95 0.05 aos 22=17.708 xR=42.557 (w-1) (R.2) col 42.557 (30-1)02.2372 17.708 10.10C oe 15.65 we goy. confident That Me populution Shandarld devistion E(l Stadent IQ Scor es is betwoln are
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